Which of the following is the correct formula for specific air range?(a) SAR=\(\frac{\eta}{C}\frac{L}{D}\frac{1}{W}\)(b) SAR=\(\frac{1}{PC}\)(c) SAR=\(\frac{\eta W}{C}\frac{L}{D}\)(d) SAR=\(\frac{1}{C}\frac{L}{D}\frac{1}{W}\)The question was posed to me by my school principal while I was bunking the class.I need to ask this question from Range and Endurance for Aircraft with Power Producing Engines in division Cruising Performance of Aircraft Performance

Which of the following is the correct formula for specific air range?(

1.	Which of the following is the correct formula for specific air range?(a) SAR=\(\frac{\eta}{C}\frac{L}{D}\frac{1}{W}\)(b) SAR=\(\frac{1}{PC}\)(c) SAR=\(\frac{\eta W}{C}\frac{L}{D}\)(d) SAR=\(\frac{1}{C}\frac{L}{D}\frac{1}{W}\)The question was posed to me by my school principal while I was bunking the class.I need to ask this question from Range and Endurance for Aircraft with Power Producing Engines in division Cruising Performance of Aircraft Performance
Answer» Correct answer is (a) SAR=\(\frac{\eta}{C}\frac{L}{D}\frac{1}{W}\) The BEST explanation: The correct formula for specific air range is given by SAR=\(\frac{\eta}{C}\frac{L}{D}\frac{1}{W}\) where η is propeller efficiency, C is specific fuel consumption, L is LIFT, D is DRAG, W is weight. SAR can also be WRITTEN as SAR=\(\frac{V}{CP}\) where v is velocity, C is specific fuel consumption and P is power.

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